Arrambide Detention Dam X Reservoir Report
Last Updated: December 20, 2025
Arrambide Detention Dam X, located in Nashua, Montana, serves multiple purposes including fire protection, stock, and serving as a small fish pond.
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Summary
Managed by the Bureau of Land Management, this gravity dam was completed in 1957 and stands at a structural height of 17 feet with a hydraulic height of 12 feet. The dam has a storage capacity of 970 acre-feet and covers a surface area of 136.1 acres, making it a crucial resource in the area.
With a low hazard potential and fair condition assessment, Arrambide Detention Dam X plays a vital role in the management and conservation of water resources in the region. It provides essential water storage for agricultural and environmental purposes, ensuring a stable supply for irrigation and wildlife habitats. The dam's location on Willow Creek and the Milk River further enhances its significance in water management and climate resilience efforts.
As a federally owned and operated structure, Arrambide Detention Dam X is subject to regular inspections and maintenance by the Bureau of Land Management. Despite its moderate risk assessment, the dam is well-maintained and poses no immediate threat to surrounding communities. Its strategic design and purposeful construction highlight the importance of sustainable water resource management in the face of changing climate patterns and increasing water demands.
Year Completed |
1957 |
Dam Length |
1367 |
River Or Stream |
WILLOW CK./MILK RIVER |
Primary Dam Type |
Gravity |
Surface Area |
136.1 |
Hydraulic Height |
12 |
Drainage Area |
0.6 |
Nid Storage |
970 |
Structural Height |
17 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Arrambide Detention Dam X